Improvement in tanning



To allwho iatt may cancer-a.-

b Be it known that LCHARLES E.PANKNIN, ofOharles- .ton, in the dist-riot of Charleston and State of South Carolina, have invented anewand improved Mode of Tanning; and I do hereby declare that the following is afull, clear,-and exact description thereof.

I The nature of my invention consists in the useof 'carbolic acid, combined with alum in suitable proper-,- tions hereinafter mentioned, in the process of1tanning hides; i After the hides have been'd'epilated by the usual wellknown process, I-treat them with a' solution composed of car-bolic acid and alum. I prefer to employ, say, ten" (10) parts of .aluln undone-half (a) part of carb olic.acid, althougl1' I do not,confine myself to these exact proportions, as a greater or lesser quantityof the q catholic acid may be used, according to circumstances.

For kid and other light skins, twenty-four hours immersion in the solution aboveinarned will effectually tan them, but for heavy hides, a" somewhat longer Y timewiil he required,according to the degree ot'ithicknessg. firmness, and other conditions of such hides.

By the use of, the solution of carboiic acid and alum for tanning, no change of color will be .producejdiu the hides; hence the adaptability and valueof such solu, tion in the manufacture of leather, which is afterward required to bebleaohed, or to be artificially colored. I The improved solution will operate to loosen the fibers of the hides, and thus allow them/to be perme-v atedfreely and quickly, audit will also increase the weight of the leather producedywithout impairing its quality in the least degree.. .7 y 1.0wing'to the exceedingly small percentage of carholie acid required in a given quantity-of the solution, the expense of conducting the process will not be 1 greater, if i as great, as

l a'niud gmt5 1 liquid in anymanner prevent the the expense of material and oHARLEsFLPA KNIN; or CHARLESTON, SOUTH CAROLINA} I Lotters'Patent Nov 107,713, dated September 2 7, 1870.

IMPROVEMENT IN TANNING.

The Schedule referred to in these Letters Patent'and making part at the same.

time required under the old process. I use water as the solvent of the carbolic or phenic acid.

Some of the advantages attending the use of this compound are-' V v First, alum, with carbolic acid, will impart to the tanning-liquid greater density, and, hence, the more rapid infiltration.

Second, alum, with carholic acid, has the property of loosening the fibers-of the skin, and the gelatinous fibersbecome more thoroughly impregnated with the tanning-liquid.

Third, skins which are tanned with alum and carholic acid'a're not changed in their. color, nor does this subsequent artificial coloringoi theleather. I

Fourth in using alum with carbolic acid a decommetallic astringents, as, in this case, acid is liberated.

Fifth, leather made with carbolic acid and alum is light, and the surface presents, after finishing, a smooth and even'appearance.. l 1

Sixth, and alum is far more economical than any other mineral astringent.

Havin thus described my invention, What? claim as new, and desire to secure by Letter Patent, is

The use of 'carbolic acid in the process of tanning, substantially as described. 4

' CHARLES E. PANKNIN. Witnesses: V

J. S. CAMPBELL, Emu. F. BROWN. 

